JavaScript for…in vs for

Question

Do you think there is a big difference in for...in and for loops? What kind of \"for\" do you prefer to use and why?

Let\'s say we have an array of associative array

Answer 1

A shorter and best code according to jsperf is

keys  = Object.keys(obj);
for (var i = keys.length; i--;){
   value = obj[keys[i]];// or other action
}